Acknowledgments

We thank Boris Blokland and Przemysław Pawełczak for their contributions to the early development of the virtual source concept. Thanks also to the staff at the Center for Information Services and High Performance Computing (ZIH) at TU Dresden for their support with network and backend infrastructure. This work has been partially funded by the German Research Foundation (DFG) through the Cluster of Excellence cfaed (EXC 1056) and the Emmy Noether project NextIoT (ZI 1635/2-1); by the Saxon State Ministry for Science, Culture and Tourism; and by the LOEWE initiative (Hesse, Germany) within the emergenCITY center (LOEWE/1/12/519/03/05.001(0016)/72).